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2P = 10/4 L
Keliling = 2P + 2L
= 10/4L + 2L
= 18/4L
18/4L = 72
L = 72 * 4 / 18
L = 16 cm
P = 5/4L
P = 5/4(16)
P = 20 cm
Luas = PL
= (16)(20)
= 320 cm²